US4169338A - Telescopic boom - Google Patents

Telescopic boom Download PDF

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Publication number
US4169338A
US4169338A US05/828,663 US82866377A US4169338A US 4169338 A US4169338 A US 4169338A US 82866377 A US82866377 A US 82866377A US 4169338 A US4169338 A US 4169338A
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Prior art keywords
section
rotation
gear wheel
chain
movement
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Expired - Lifetime
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US05/828,663
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Geir Eik
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A S NORMAR
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A S NORMAR
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62Constructional features or details
    • B66C23/64Jibs
    • B66C23/70Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/706Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by other means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/18Mechanical movements
    • Y10T74/18056Rotary to or from reciprocating or oscillating

Definitions

  • the present invention relates to a telescopic boom including three or more sections which may be pivoted if desired, and of which the innermost section is constituted by a housing which is incapable of moving in the longitudinal direction, whereas the other sections are adapted to be concurrently dislocated in the longitudinal direction relative to the respective adjacent sections located inwardly thereof, when the boom is to be lengthened or shortened.
  • hydraulic cylinders are mostly used for the extension and retraction of the boom.
  • a cylinder housed in its own telescope section or a cylinder common to all of the telescope sections may be used.
  • the task underlying the present invention is to arrive at a telescopic boom which is not encumbered with the above mentioned disadvantages.
  • this task is fulfilled due to the fact that for dislocating each of the sections movable in the longitudinal direction, a mechanical drive mechanism is provided which is located on the adjacent section located inwardly thereof and that only the drive mechanism on the innermost section, which is not movable in the longitudinal direction, is adapted to be supplied with energy from an outside source, the actuation of each of the other drive mechanisms being accomplished by a drive means mounted on the same section as the associated drive mechanism and is in engagement with the adjacent section located inwardly thereof, so as to be driven by the relative motion of this section and the section on which the drive means is mounted.
  • a telescopic boom is achieved which affords a uniform pushing force outwardly and the same pulling force inwardly and, at the same time, there are obtained telescopic booms which with the same constructional dimensions, have a larger capacity compared with known telescopic booms driven by hydraulics.
  • FIG. 1 is a side view, partly in section, of a telescopic boom according to the invention comprising two boom sections.
  • FIG. 2 is a view of the telescopic boom of FIG. 1 as seen from above.
  • FIG. 4 is a sectional view similar to FIG. 3 of a telescopic boom according to the invention having an additional boom section.
  • Telescopic booms of the type which will be discussed in the following find application, for example, on drilling platforms in connection with the handling of sections of drilling pipes and lining pipes or units comprising a plurality of such sections.
  • the telescopic boom is usually located in the area of the turntable of the drilling string in which it is pivotally mounted on a suitable base.
  • the telescopic boom is provided with a gripping head serving to grip around the pipe units for handling same.
  • the pipe units may be moved to or from the area of the turntable by a suitable change of length and swinging of the boom.
  • FIGS. 1-3 which depict details of a telescopic boom designed according to the present invention and comprising two boom sections
  • 1 designates a substantially round base unit housing driving means for rotating an annular rotating disk 2.
  • 3 designates a telescope housing which is affixed to the rotating disk 2 and which can be swung horizontally together with the rotating disk 2.
  • the base unit may take such a form that a hoisting and lowering motion may be imparted to the telescope housing 3.
  • a first telescope or boom section 4 of substantially the same shape as the telescope housing 3, i.e. having four walls which define a substantially rectangular hollow pipe, but having dimensions which permit it to travel out of and into the housing 3 with a suitable play.
  • the boom section 4 is supported on a plurality of sliding or guiding pieces 5 attached to the inner walls of the housing.
  • On the outside of the upper wall the section 4 carries a longitudinal rack 6, which is in engagement with a drive gear wheel 7 mounted on the outside of the housing 3.
  • the shaft 8 of the gear wheel is supported at its free end in a bearing 9 and is at the driving end connected to a hydraulic coupling means 10 driven by a hydraulic motor 11.
  • the coupling means 10 and the hydraulic motor 11 receive hydraulic pressure transferred from an oil supply (not shown) via pipes 12 and 13, respectively.
  • the part of the gear wheel 7 engaging the rack 6 on the section 4 protrudes through an opening 14 in the upper part of the housing.
  • the boom section 4 will, dependent on the direction of rotation of the motor, be passed out of the housing 3 or pulled into it. Concurrently with the movement of the boom section 4 also another boom section 15, which is provided in the section 4, will move relative thereto in a manner which will be more fully discussed in the following.
  • the movement of the second boom section 15 relative to the section 4 is primarily brought about by means of a gear wheel 16 which with its shaft 17 is pivotally supported at the inner end of the section 4.
  • a portion of the gear wheel 16 protrudes through an opening 18 in the section 4 and is in engagement with a longitudinally moving rack 19 provided on the inside of the bottom portion of the housing 3.
  • a sprocket wheel 20 and 21 At each end of the shaft 17 there is affixed a sprocket wheel 20 and 21, respectively.
  • Two chains 22 and 23, respectively, are passed around individual sprocket wheels 20 and 21, respectively, and further around individual sprocket wheels 24 and 25, respectively, which are rotatably mounted on the inside of the outer end of the section 4.
  • the bearings of the sprocket wheels 24 and 25 are indicated at 26 and 27, respectively.
  • the chains 22 and 23 are connected to the boom section 15 by means of attachment means 28 and 29, respectively.
  • the chains 22 and 23 will dislocate the section 15 relative to the section 4, so as to impart a telescopic extension or retraction to the boom.
  • the section 15 is supported by sliding or guiding pieces 30 provided on the inside of the section 4.
  • sliding or guiding rollers bearing on the section 15.
  • FIG. 4 is a sectional view of a telescopic boom which includes an additional telescope or boom section 32.
  • the view, according to FIG. 4 corresponds to a section taken along the line IV--IV in FIG. 1, and as regards the parts which are illustrated in connection with FIG. 3 and which are repeated in FIG. 4, the same reference numerals are assigned thereto.
  • a longitudinal rack 33 which extends from the area of the gear wheel 16 to the front end of the section.
  • a gear wheel 34 which with its shaft 35 is rotatably mounted in the inner end of the boom section, is in engagement with the rack 3.
  • a portion of the gear wheel 34 protrudes through an opening 36 in the lower portion of the section 15, and at each end of the shaft 35 of the gear wheel there is mounted a sprocket wheel 37 and 38, respectively.
  • each sprocket wheel 37 and 38, respectively there is passed a chain 39 and 40, respectively, the chain 39 being further passed around a sprocket wheel 41 provided at the outer end of the section 15 and the chain 40 being passed around a second sprocket wheel 42 which is placed oppositely of the wheel 41 at the outer end of the section 15.
  • the chains 39 and 40 are connected to the section 32 by attachment means 43 and 44, respectively.
  • the gear wheel 34 which is in engagement with the rack 33 is rotating due to the relative motion of sections 15 and 4, as explained above in connection with FIGS. 1 to 3, the chains 39 and 40 will dislocate section 32 relative to section 15 for so as to give the boom an additional telescopic extension or retraction.
  • the section 32 is supported by sliding and guiding pieces 45 provided on the inside of the section 15. Also in the embodiment of FIG. 4, at the outer end of the section 15, there is provided sliding and guiding rollers 46 bearing against the section 32 and serving for a further stabilization of the same when it is in the fully extended position.
  • telescopic booms described above can be expanded to comprise more than three boom sections depending on the application for which the boom is calculated. It is also to be understood that the mechanical power transmission from boom section to boom section can be effected in various manners without departing from the scope of the invention.
  • the chains for driving a first boom section may be so adapted that they transfer their movement to a shaft mounted in another boom section which is moved relative to the first.
  • the gear wheel will then rotate, but as it concurrently engages the said rack, the rotating movement will be transferred into a linear motion for the second section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Pens And Brushes (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Jib Cranes (AREA)

Abstract

A telescopic boom includes three or more sections which may be pivoted if desired. The innermost section is incapable of moving in the longitudinal direction, whereas the other sections are adapted to be concurrently dislocated in the longitudinal direction relative to each other. Only a drive mechanism on the innermost section is adapted to be actuated from an outside source, whereas the other sections are driven by the relative motion of the sections movable in the longitudinal direction.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a telescopic boom including three or more sections which may be pivoted if desired, and of which the innermost section is constituted by a housing which is incapable of moving in the longitudinal direction, whereas the other sections are adapted to be concurrently dislocated in the longitudinal direction relative to the respective adjacent sections located inwardly thereof, when the boom is to be lengthened or shortened.
2. Description of the Prior Art
In known telescopic booms hydraulic cylinders are mostly used for the extension and retraction of the boom. For each telescope section there may then be used a cylinder housed in its own telescope section, or a cylinder common to all of the telescope sections may be used.
Due to the different effective cylinder area during extension or retraction of the cylinder section, respectively, such known telescopic booms suffer from the disadvantage that the pushing force and the pulling force are not equal. Besides, when using hydraulic cylinders, sealing problems will occur due to wear of the guiding portions.
SUMMARY OF THE INVENTION
The task underlying the present invention is to arrive at a telescopic boom which is not encumbered with the above mentioned disadvantages. According to the invention, in a telescopic boom of the type mentioned in the preamble, this task is fulfilled due to the fact that for dislocating each of the sections movable in the longitudinal direction, a mechanical drive mechanism is provided which is located on the adjacent section located inwardly thereof and that only the drive mechanism on the innermost section, which is not movable in the longitudinal direction, is adapted to be supplied with energy from an outside source, the actuation of each of the other drive mechanisms being accomplished by a drive means mounted on the same section as the associated drive mechanism and is in engagement with the adjacent section located inwardly thereof, so as to be driven by the relative motion of this section and the section on which the drive means is mounted.
Hereby a telescopic boom is achieved which affords a uniform pushing force outwardly and the same pulling force inwardly and, at the same time, there are obtained telescopic booms which with the same constructional dimensions, have a larger capacity compared with known telescopic booms driven by hydraulics.
The invention will in the following be described in further detail, reference being had to the drawings which illustrate preferred embodiments of the structure according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view, partly in section, of a telescopic boom according to the invention comprising two boom sections.
FIG. 2 is a view of the telescopic boom of FIG. 1 as seen from above.
FIG. 3 is a horizontal sectional view through the telescopic boom of FIG. 1, but wherein the outermost boom section is not shown in section.
FIG. 4 is a sectional view similar to FIG. 3 of a telescopic boom according to the invention having an additional boom section.
DESCRIPTION OF PREFERRED EMBODIMENTS
Telescopic booms of the type which will be discussed in the following, find application, for example, on drilling platforms in connection with the handling of sections of drilling pipes and lining pipes or units comprising a plurality of such sections. The telescopic boom is usually located in the area of the turntable of the drilling string in which it is pivotally mounted on a suitable base. At the free end of the outermost telescope section, the telescopic boom is provided with a gripping head serving to grip around the pipe units for handling same. By means of the telescopic boom, the pipe units may be moved to or from the area of the turntable by a suitable change of length and swinging of the boom.
In FIGS. 1-3, which depict details of a telescopic boom designed according to the present invention and comprising two boom sections, 1 designates a substantially round base unit housing driving means for rotating an annular rotating disk 2. 3 designates a telescope housing which is affixed to the rotating disk 2 and which can be swung horizontally together with the rotating disk 2. If desired, the base unit may take such a form that a hoisting and lowering motion may be imparted to the telescope housing 3.
In the housing 3, which is constructed substantially as a rectangular pipe, there is provided a first telescope or boom section 4 of substantially the same shape as the telescope housing 3, i.e. having four walls which define a substantially rectangular hollow pipe, but having dimensions which permit it to travel out of and into the housing 3 with a suitable play. The boom section 4 is supported on a plurality of sliding or guiding pieces 5 attached to the inner walls of the housing. On the outside of the upper wall the section 4 carries a longitudinal rack 6, which is in engagement with a drive gear wheel 7 mounted on the outside of the housing 3. The shaft 8 of the gear wheel is supported at its free end in a bearing 9 and is at the driving end connected to a hydraulic coupling means 10 driven by a hydraulic motor 11. The coupling means 10 and the hydraulic motor 11 receive hydraulic pressure transferred from an oil supply (not shown) via pipes 12 and 13, respectively. The part of the gear wheel 7 engaging the rack 6 on the section 4 protrudes through an opening 14 in the upper part of the housing.
During operation of the motor 11 the boom section 4 will, dependent on the direction of rotation of the motor, be passed out of the housing 3 or pulled into it. Concurrently with the movement of the boom section 4 also another boom section 15, which is provided in the section 4, will move relative thereto in a manner which will be more fully discussed in the following.
The movement of the second boom section 15 relative to the section 4 is primarily brought about by means of a gear wheel 16 which with its shaft 17 is pivotally supported at the inner end of the section 4. A portion of the gear wheel 16 protrudes through an opening 18 in the section 4 and is in engagement with a longitudinally moving rack 19 provided on the inside of the bottom portion of the housing 3. At each end of the shaft 17 there is affixed a sprocket wheel 20 and 21, respectively. Two chains 22 and 23, respectively, are passed around individual sprocket wheels 20 and 21, respectively, and further around individual sprocket wheels 24 and 25, respectively, which are rotatably mounted on the inside of the outer end of the section 4. In FIG. 3 the bearings of the sprocket wheels 24 and 25 are indicated at 26 and 27, respectively.
The chains 22 and 23 are connected to the boom section 15 by means of attachment means 28 and 29, respectively. When the gear wheel 16 engaging the rack 19 is rotating due to relative movement of the section 4 and the housing 3 consequent to the gear wheel 7 being driven, the chains 22 and 23 will dislocate the section 15 relative to the section 4, so as to impart a telescopic extension or retraction to the boom.
In a similar manner as the section 4, the section 15 is supported by sliding or guiding pieces 30 provided on the inside of the section 4. At the outer end of the section 4 there are also provided sliding or guiding rollers bearing on the section 15.
FIG. 4 is a sectional view of a telescopic boom which includes an additional telescope or boom section 32. The view, according to FIG. 4 corresponds to a section taken along the line IV--IV in FIG. 1, and as regards the parts which are illustrated in connection with FIG. 3 and which are repeated in FIG. 4, the same reference numerals are assigned thereto. Thus, also here 3 designates the housing, 4 the first boom section, 15 the second boom section etc.
In the boom section 4 shown in FIG. 4, in addition to the parts already included beforehand, there is provided a longitudinal rack 33 which extends from the area of the gear wheel 16 to the front end of the section. A gear wheel 34, which with its shaft 35 is rotatably mounted in the inner end of the boom section, is in engagement with the rack 3. A portion of the gear wheel 34 protrudes through an opening 36 in the lower portion of the section 15, and at each end of the shaft 35 of the gear wheel there is mounted a sprocket wheel 37 and 38, respectively. Around each sprocket wheel 37 and 38, respectively, there is passed a chain 39 and 40, respectively, the chain 39 being further passed around a sprocket wheel 41 provided at the outer end of the section 15 and the chain 40 being passed around a second sprocket wheel 42 which is placed oppositely of the wheel 41 at the outer end of the section 15.
The chains 39 and 40 are connected to the section 32 by attachment means 43 and 44, respectively. When the gear wheel 34 which is in engagement with the rack 33, is rotating due to the relative motion of sections 15 and 4, as explained above in connection with FIGS. 1 to 3, the chains 39 and 40 will dislocate section 32 relative to section 15 for so as to give the boom an additional telescopic extension or retraction.
In a similar manner as the sections 4 and 15, the section 32 is supported by sliding and guiding pieces 45 provided on the inside of the section 15. Also in the embodiment of FIG. 4, at the outer end of the section 15, there is provided sliding and guiding rollers 46 bearing against the section 32 and serving for a further stabilization of the same when it is in the fully extended position.
It is to be understood that the telescopic booms described above can be expanded to comprise more than three boom sections depending on the application for which the boom is calculated. It is also to be understood that the mechanical power transmission from boom section to boom section can be effected in various manners without departing from the scope of the invention.
For example, the chains for driving a first boom section may be so adapted that they transfer their movement to a shaft mounted in another boom section which is moved relative to the first. On the said shaft of the second section there may then be provided a gear wheel which engages a rack on the first section. During movement of the chains the gear wheel will then rotate, but as it concurrently engages the said rack, the rotating movement will be transferred into a linear motion for the second section.
It is further to be understood that the embodiments described above can also be combined with boom sections which are displaced in a boom section located outside thereof by means of hydraulic cylinders. Such a combination may be advantageous when a gripping head, which also works with hydraulic pressure, is mounted at the end of the outermost boom section.

Claims (4)

What is claimed is:
1. A telescopic structure comprising a plurality of elongated slidably fitted concentric tubular sections including:
(a) a first tubular housing section having at the outer surface of its one end a drive mechanism comprising a first gear wheel mounted for rotation about a fixed axis on said housing section and protruding through a slot formed therein, said first housing further having a first gear rack extending longitudinally along its internal surface;
(b) a second tubular section having an outside dimension smaller than the first housing section and having a second gear rack formed on its external surface for engagement with the first gear wheel mounted on and protruding through the housing section, whereby on rotation of said first gear wheel said second section is moved longitudinally relative to said tubular housing section;
said second section further comprising longitudinally spaced first sprocket wheels mounted for rotation adjacent opposite ends of said second section, an endless first chain extending about said sprocket wheels for moving thereby, a first pair of said first sprocket wheels being mounted for rotation on a transversely extending shaft carrying a second gear wheel which protrudes through an opening in said second section for engagement with the first gear rack on the internal surface of said housing section;
whereby on longitudinal movement of said second section caused by the rotation of said first gear wheel of said housing section, said second gear wheel will rotate to impart a movement to the endless first chain;
(c) a third section having an outside dimension smaller than the second section and means for engaging the endless first chain of the second section so as to be moved longitudinally relative to said second section upon movement of said first chain when said second section is caused to move by the rotation of said first gear wheel on the housing section.
2. The arrangement according to claim 1, wherein said first endless chain is directly connected to said third section for moving same upon movement of said chain.
3. The arrangement according to claim 1, wherein said second section includes a further gear wheel mounted for rotation upon movement of the first endless chain of said second section, and wherein said third section comprises a longitudinally extending second rack mounted in engagement with said further gear wheel of said second section further so as to be driven upon rotation thereof.
4. The arrangement according to claim 1, further including a fourth section telescoped with said third section and being mounted for concurrent longitudinal movement relative to said third section for extending and retracting the boom, a mechanical drive mechanism for effecting the movement of said fourth section includes a third gear wheel mounted for rotation about a fixed axis on said third section, a third longitudinally extending rack mounted on said second section in engagement with said third wheel, a pair of longitudinally spaced second sprocket wheels mounted for rotation adjacent opposite ends of said third section, a second endless chain extending about said second sprocket wheels, one of said second sprocket wheels being coupled with said third gear so as to be driven upon rotation thereof as said third section is moved longitudinally relative to said second section upon movement of said first chain when said second section is caused to move by the rotation of said first gear wheel on the housing section, and said second chain engaging said fourth section for moving same upon movement of said second chain during rotation of said third gear.
US05/828,663 1976-09-03 1977-08-29 Telescopic boom Expired - Lifetime US4169338A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO763044A NO140922C (en) 1976-09-03 1976-09-03 TELESCOPIC ARM.
NO763044 1976-09-03

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277335A (en) * 1978-08-11 1981-07-07 Mitutaka Hori Expansion and contraction drive apparatus
US4298128A (en) * 1980-02-19 1981-11-03 Harnischfeger Corporation Movable support for rotatable extend/retract screw in telescopic crane boom
US4575976A (en) * 1983-06-24 1986-03-18 Machine Products Corporation Extension and retraction system for boom apparatus
US4883186A (en) * 1987-10-28 1989-11-28 Werber Manuel M Easy erecting telescopic mast
DE3930464A1 (en) * 1988-09-12 1990-04-12 Fmc Corp PALLETISING DEVICE
US4954042A (en) * 1988-09-12 1990-09-04 Fmc Corporation Double telescoping arm for robotic palletizers and the like
US5168679A (en) * 1990-09-10 1992-12-08 The Will-Burt Company Telescoping mast assembly
WO1994001254A1 (en) * 1992-07-13 1994-01-20 Friedman, Mark, M. Extendible and retractable device
US5322334A (en) * 1991-07-24 1994-06-21 Mordechai Hammer Device for positively telescopically extending and retracting
US5515654A (en) * 1994-11-02 1996-05-14 Anderson; Edward E. Telescopic boom apparatus
US5718087A (en) * 1996-05-02 1998-02-17 The Will-Burt Company Telescoping mast assembly
US5881601A (en) * 1992-07-13 1999-03-16 Hammer; Mordechai Extendible and retractable reaching tool
US20050092878A1 (en) * 2003-11-03 2005-05-05 Murray Christopher J. Tripod assembly
US20070246619A1 (en) * 2006-04-21 2007-10-25 Benq Corporation Base for display device
US20080203047A1 (en) * 2005-05-19 2008-08-28 E.C.L. Guiding Device for Masts Sliding in Each Other, Telescopic Arm and Guiding Process
US20090057636A1 (en) * 2007-08-31 2009-03-05 Tait Towers Inc. Portable lift device and system
US20100040452A1 (en) * 2008-07-29 2010-02-18 Egan Thomas F Power lift and transfer system and method
US20100058913A1 (en) * 2008-09-09 2010-03-11 Leica Biosystems Nussloch Gmbh Microtome having a cassette changing apparatus
US20110018185A1 (en) * 2009-07-17 2011-01-27 Samac Robert A Automated, adjustable, machine-tool work-piece-mounting apparatus
US20130093182A1 (en) * 2011-10-18 2013-04-18 Fischer Rohrtechnik Gmbh Vacuum cleaner suction pipe
KR101264648B1 (en) 2010-08-06 2013-05-15 대우조선해양 주식회사 Double side telescopic boom for blasting robot in the double hull
US9217535B1 (en) 2013-02-21 2015-12-22 Thomas F. Egan Portable lifting and transferring techniques
CN106966305A (en) * 2017-05-22 2017-07-21 胥悦微 A kind of steel structure bridge installation hanging apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337868A (en) * 1980-02-19 1982-07-06 Harnischfeger Corporation Telescopic crane boom having rotatable extend/retract screws
GB9100642D0 (en) * 1991-01-11 1991-02-27 Altimeter The Trust Mowers
AT409485B (en) 1999-05-18 2002-08-26 Winter Udo Ing Mag TELESCOPIC BOOM FOR A VEHICLE OR A LIFT
KR101276245B1 (en) 2011-07-26 2013-06-20 현대모비스 주식회사 Double Rack gear structure for sustain Pop-Up Monitor

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US301019A (en) * 1884-06-24 Fire-escape
US1611326A (en) * 1924-04-07 1926-12-21 Elwell Parker Electric Co Extensible boom
FR696060A (en) * 1930-05-24 1930-12-26 Mechanical shovel
US2896750A (en) * 1956-04-20 1959-07-28 Jay M Eitel Telescoping assembly
US2903949A (en) * 1956-05-14 1959-09-15 John H Lucas Helve action telescoping boom compactor
US3097721A (en) * 1962-03-26 1963-07-16 Gordon L Thym Aerial ladder
US3319803A (en) * 1966-04-12 1967-05-16 Fairey Canada Ltd Retractable chain boom
US3369670A (en) * 1967-04-25 1968-02-20 Robert G. Letourneau Boom type cranes
GB1183181A (en) * 1968-02-29 1970-03-04 Henry Austin Cooch Improvements in Portable Telescopic Masts
CA904530A (en) * 1969-10-10 1972-07-11 R. Hayes John Telescopic structure assemblies
US3722154A (en) * 1970-01-31 1973-03-27 T Sakamoto Extensible boom with buckling-prevention
US3749254A (en) * 1972-04-28 1973-07-31 Bucyrus Erie Co Boom extension lock
US3800965A (en) * 1972-01-11 1974-04-02 H Pavone Ladle skimming mechanism
US3807108A (en) * 1972-09-18 1974-04-30 Harnischfeger Corp Structural design of boom section with inverted {37 a{38 {11 frame cross-section
US3889818A (en) * 1973-09-21 1975-06-17 Carl G Wennerstrom Extensible crane
US3913756A (en) * 1972-01-11 1975-10-21 Grant Inc Louis A Ladle skimmer
US4004695A (en) * 1975-04-16 1977-01-25 Fulton Industries, Inc. Channel and plate telescopic crane boom

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US301019A (en) * 1884-06-24 Fire-escape
US1611326A (en) * 1924-04-07 1926-12-21 Elwell Parker Electric Co Extensible boom
FR696060A (en) * 1930-05-24 1930-12-26 Mechanical shovel
US2896750A (en) * 1956-04-20 1959-07-28 Jay M Eitel Telescoping assembly
US2903949A (en) * 1956-05-14 1959-09-15 John H Lucas Helve action telescoping boom compactor
US3097721A (en) * 1962-03-26 1963-07-16 Gordon L Thym Aerial ladder
US3319803A (en) * 1966-04-12 1967-05-16 Fairey Canada Ltd Retractable chain boom
US3369670A (en) * 1967-04-25 1968-02-20 Robert G. Letourneau Boom type cranes
GB1183181A (en) * 1968-02-29 1970-03-04 Henry Austin Cooch Improvements in Portable Telescopic Masts
CA904530A (en) * 1969-10-10 1972-07-11 R. Hayes John Telescopic structure assemblies
US3722154A (en) * 1970-01-31 1973-03-27 T Sakamoto Extensible boom with buckling-prevention
US3800965A (en) * 1972-01-11 1974-04-02 H Pavone Ladle skimming mechanism
US3913756A (en) * 1972-01-11 1975-10-21 Grant Inc Louis A Ladle skimmer
US3749254A (en) * 1972-04-28 1973-07-31 Bucyrus Erie Co Boom extension lock
US3807108A (en) * 1972-09-18 1974-04-30 Harnischfeger Corp Structural design of boom section with inverted {37 a{38 {11 frame cross-section
US3889818A (en) * 1973-09-21 1975-06-17 Carl G Wennerstrom Extensible crane
US4004695A (en) * 1975-04-16 1977-01-25 Fulton Industries, Inc. Channel and plate telescopic crane boom

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277335A (en) * 1978-08-11 1981-07-07 Mitutaka Hori Expansion and contraction drive apparatus
US4298128A (en) * 1980-02-19 1981-11-03 Harnischfeger Corporation Movable support for rotatable extend/retract screw in telescopic crane boom
US4575976A (en) * 1983-06-24 1986-03-18 Machine Products Corporation Extension and retraction system for boom apparatus
US4883186A (en) * 1987-10-28 1989-11-28 Werber Manuel M Easy erecting telescopic mast
DE3930464A1 (en) * 1988-09-12 1990-04-12 Fmc Corp PALLETISING DEVICE
US4954042A (en) * 1988-09-12 1990-09-04 Fmc Corporation Double telescoping arm for robotic palletizers and the like
US5168679A (en) * 1990-09-10 1992-12-08 The Will-Burt Company Telescoping mast assembly
US5322334A (en) * 1991-07-24 1994-06-21 Mordechai Hammer Device for positively telescopically extending and retracting
US5881601A (en) * 1992-07-13 1999-03-16 Hammer; Mordechai Extendible and retractable reaching tool
WO1994001254A1 (en) * 1992-07-13 1994-01-20 Friedman, Mark, M. Extendible and retractable device
US5515654A (en) * 1994-11-02 1996-05-14 Anderson; Edward E. Telescopic boom apparatus
US5718087A (en) * 1996-05-02 1998-02-17 The Will-Burt Company Telescoping mast assembly
US20050092878A1 (en) * 2003-11-03 2005-05-05 Murray Christopher J. Tripod assembly
US7011280B2 (en) 2003-11-03 2006-03-14 Black & Decker Inc. Tripod assembly
US20080203047A1 (en) * 2005-05-19 2008-08-28 E.C.L. Guiding Device for Masts Sliding in Each Other, Telescopic Arm and Guiding Process
US7779580B2 (en) * 2005-05-19 2010-08-24 E.C.L. Guiding device for masts which telescopes within each other
US7762504B2 (en) * 2006-04-21 2010-07-27 Qisda Corporation Base for display device
US20070246619A1 (en) * 2006-04-21 2007-10-25 Benq Corporation Base for display device
US20090057636A1 (en) * 2007-08-31 2009-03-05 Tait Towers Inc. Portable lift device and system
US9526663B2 (en) 2008-07-29 2016-12-27 Egan Thomas F Power lift and transfer system and method
US20100040452A1 (en) * 2008-07-29 2010-02-18 Egan Thomas F Power lift and transfer system and method
US8540474B2 (en) * 2008-07-29 2013-09-24 Thomas F. Egan Power lift and transfer system and method
US20100058913A1 (en) * 2008-09-09 2010-03-11 Leica Biosystems Nussloch Gmbh Microtome having a cassette changing apparatus
US20110018185A1 (en) * 2009-07-17 2011-01-27 Samac Robert A Automated, adjustable, machine-tool work-piece-mounting apparatus
US8469345B2 (en) * 2009-07-17 2013-06-25 C D P Holdings, LLC Automated, adjustable, machine-tool work-piece-mounting apparatus
KR101264648B1 (en) 2010-08-06 2013-05-15 대우조선해양 주식회사 Double side telescopic boom for blasting robot in the double hull
US20130093182A1 (en) * 2011-10-18 2013-04-18 Fischer Rohrtechnik Gmbh Vacuum cleaner suction pipe
US9217535B1 (en) 2013-02-21 2015-12-22 Thomas F. Egan Portable lifting and transferring techniques
US10443783B1 (en) 2013-02-21 2019-10-15 Thomas F. Egan Portable lifting and transferring techniques
US10837598B1 (en) 2013-02-21 2020-11-17 Thomas F. Egan Portable lifting and transferring techniques
US11293588B1 (en) 2013-02-21 2022-04-05 Thomas F. Egan Portable lifting and transferring techniques
CN106966305A (en) * 2017-05-22 2017-07-21 胥悦微 A kind of steel structure bridge installation hanging apparatus

Also Published As

Publication number Publication date
NO763044L (en) 1978-03-06
NO140922C (en) 1979-12-12
GB1550072A (en) 1979-08-08
NO140922B (en) 1979-09-03

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